Circuits for receiving radio and similar signals



L. M. E. CLAUSING cmcuns FOR RECEIVING RADIO AND SIMILAR SIGNALS Filed Ag. 16, 1923 May 8, 1928. 1,668,630

Leroy M. E.CZdl/5i11j Patented May 8, 1928.

UNITED STATES L EROY M. E. CLAUSING, OF CHICAGO, ILLINOIS.

CIRCUITS FOR.RECEIVING RADIO. AND SIMILAR SIGNALS.

Application filed August 16, 1923. Serial No. 657,745.

an inductance L to a buried wire or otherform of lineal collector of radio energy 2.

The condensers C, C and C provide for balancing the collecting system. The earth connections Gr and G, provide grounds for the collecting system. The receivers R and R conventionally shown, are coupled to secondaries S and S respectivcly, the receivers and the secondaries being tunable to any desired wave lengths by suitable capacities and inductances. Suitable detecting devices D and D are connected to the secondaries S S The receivers R and R are very loosely coupled to the collecting system through very small capacities X and X and it is this very loose capacity coupling that makes my system effective for the simultaneous reception of a plurality of high frequency signals on the same collector. V

A preliminary to my invention is described in the 1919 edition of Robinsons Manual of Radio Telegraphy and Tele hony article 210, at page 180 which iscloses an antenna system in which. a plurality of receivers are coupled to a single loop antenna. At the time of this publication it was not appreciated that the coupling condensers should be of very small capacity, and this accounts for the statement in this publication that the tuning of one circuit effects the tuning of theother circuits. By employing a very small coupling condenser the various receiving circuits can be manipulated for tuning without interference with the other circuits, and I have actually received signals from four European stations'difi'erent in wave length by less than four percent, at wave lengths in the neighborhood of twelve thousand meters,

without any interference or cross tuning.

between the receiving circuits when manipulated for tuning. In this instance the capacities of the coupling condensers K were of the order of one hundred micro microfarads.

It is preferable that the collector should be aperiodic, or detuned to a frequency outside of the range in which the various re-, ceivers are operating.

\Vhile I have illustrated a com licated form of collector, the collector use is not a part of my invention, and it is to be understood that any desired form may be used without departing from the spirit of the invention.

Having described my invention, I claim:

1. In a system for the simultaneous reception of high frequency signals of different frequency, t-hecombination of a capacity antenna, an inductance and a loop antenna connected in scries,-a variable condenser between the free end of the loop antenna and the ground, a plurality of variable condensers in series with each other and connected between one end of the inductance and the ground, a plurality of resonant cir- 2. In a system for the simultaneous reception of high frequency signals of different frequency, the combination of a capacity antenna, an inductance and a loop antenna connected in series, a variable condenser between the free end of the loop antenna and the ground, a plurality of variablecondensers in series with each other and connected between one end of the inductance and the ground, a plurality of resonant circuits and a corresponding number of small capacity condensers, each of said resonant circuits and its corresponding condensers being connected in series between the other end of said inductance and a point between the series condensers.

LEROY M. E. CLAUSING. 

